EP2106571A1 - Système de projection del multiprimaire - Google Patents

Système de projection del multiprimaire

Info

Publication number
EP2106571A1
EP2106571A1 EP07849461A EP07849461A EP2106571A1 EP 2106571 A1 EP2106571 A1 EP 2106571A1 EP 07849461 A EP07849461 A EP 07849461A EP 07849461 A EP07849461 A EP 07849461A EP 2106571 A1 EP2106571 A1 EP 2106571A1
Authority
EP
European Patent Office
Prior art keywords
light
wavelengths
range
color
color channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07849461A
Other languages
German (de)
English (en)
Inventor
Serge Bierhuizen
Gerard Harbers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lumileds LLC
Original Assignee
Philips Lumileds Lighing Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Lumileds Lighing Co LLC filed Critical Philips Lumileds Lighing Co LLC
Publication of EP2106571A1 publication Critical patent/EP2106571A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3158—Modulator illumination systems for controlling the spectrum
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources

Definitions

  • the present invention relates generally to projection systems that use light emitting diodes (LEDs), and in particular to a combining spectra in a multiple LED projection system.
  • LEDs light emitting diodes
  • Light emitting diode based projection systems combine different colors of light produced by multiple LEDs.
  • the different colors of light may be combined to produce a source of white light, or alternatively, an optical display, sometimes referred to as micro- display, e.g., liquid crystal on silicon (LCOS) or digital light processing (DLP), may be used to impart image information on the combined light or on each color of light before the light is combined.
  • LCOS liquid crystal on silicon
  • DLP digital light processing
  • Fig. 1 is a graph illustrating the spectral curves of a six primary LED projection system, i.e., a projection system that combines the light from six differently colored LEDs.
  • Fig. 1 illustrates the spectral curves for Blue, Blue-Cyan, Cyan-Green, Green, Yellow- Orange, and Red colored light.
  • the areas 12 and 14 for example, there is substantial overlap in the spectra. The overlap is problematic as it leads to a loss of brightness in conventional systems.
  • Fig. 2 schematically illustrates two LEDs 22g and 22yo, which produce green and yellow-orange light, respectively, along with associated lenses 24g and 24yo.
  • light from the LEDs 22g and 22yo is combined using a dichroic filter 26, which reflect some wavelengths and transmit other wavelengths.
  • the dichroic filter 26 may reflect wavelengths above 570nm and transmits wavelengths below 570nm.
  • the spectral contribution from the Yellow- Orange light below 570nm will be lost because it is transmitted through the dichroic filter 26, as indicated by the dotted lines 28 in Fig. 2, as opposed to being reflected by the dichroic filter 26 along the desired beam path 30.
  • overlapping spectral contributions in multi-primary LED projection systems results in lost light when combining the different channels, and therefore a decrease in brightness.
  • Fig. 3 is a CIE 1931 color space chromacity diagram illustrating a six LED primary system.
  • the space defined by the line 30 labeled "BCCGYR” is the gamut of color that can be matched by various combinations of the Blue, Blue-Cyan, Cyan-Green, Green, Yellow- Orange, and Red colored light.
  • the multi-primary projection system combines the colors into Blue, Green and Red channels.
  • the Blue and Blue-Cyan are combined into the Blue channel
  • the Cyan-Green and Green are combined into the Green channel
  • the Yellow-Orange and Red are combined into the Red channel.
  • the spectral losses caused by the combination of these channels can be seen in areas 12 and 14 in Fig. 1.
  • the space defined by the line 32 labeled "Combined” is the gamut of color that can be matched by various combinations of the Blue, Green and Red channels. As can be seen, conventional systems greatly limit the gamut of the color spectrum that can be produced.
  • a multi-primary light emitting diode system includes the use of a polarization based dichroic element to combine light from different color channels. At least one of the color channels includes two light emitting diodes that produce light with a different range of wavelengths.
  • the use of the polarization based dichroic element permits overlapping spectra from different color channels to be combined without loss. Accordingly, the brightness of the system is improved relative to conventional systems in which losses occur when combining overlapping spectra from different channels.
  • Fig. 1 is a graph illustrating the spectral curves of a six primary LED projection system.
  • Fig. 2 schematically illustrates combining light from two LEDs.
  • Fig. 3 is a CIE 1931 color space chromaticity diagram illustrating a six LED primary system.
  • Fig. 4 is a multi -primary LED projection system that combines the light from multiple channels, at least one of which includes two different colored LEDs, using a polarization based dichroic element, in accordance with an embodiment of the present invention.
  • Fig. 5 illustrates schematically the combination of three color channels using a polarization dependent dichroic X-cube.
  • Fig. 6 is a graph of the throughput for a polarization dependent dichroic X-cube for orthogonal polarization axes.
  • Figs. 7A and 7B graphically illustrate the transmission of a polarization dependent dichroic X-cube with respect to the spectra in different color channels.
  • Fig. 8 is another embodiment of a multi-primary LED projection system that combines the light from multiple channels, at least one of which includes two different colored LEDs, using a polarization based dichroic element.
  • Fig. 9 is yet another embodiment of a multi-primary LED projection system that combines the light from multiple channels, at least one of which includes two different colored LEDs, using a polarization based dichroic element.
  • Fig. 10 illustrates a controller with a pulse width modulation circuit that controls one or more color channels in a multi-primary LED projection system.
  • Fig. 11 illustrates controlling the LEDs in a color channel with a 50% PWM duty cycle.
  • Fig. 12 is a another CIE 1931 color space chromacity diagram, similar to that shown in Fig. 3, but illustrating the effect of controlling the multi-primary LED projection system.
  • Fig. 4 is a multi -primary LED projection system 100 that combines the light from multiple channels, at least one of which includes two different colored LEDs, without a loss of brightness by using a polarization based dichroic element, such as a polarization dependent X-cube, in accordance with an embodiment of the present invention.
  • a polarization based dichroic element such as a polarization dependent X-cube
  • Projection system 100 is illustrated as including six LEDs 102B, 102BC, 102CG, 102G, 102YO, and 102R, sometimes collectively or individually referred to herein as LED(s) 102, each having a different color, Blue, Blue-Cyan, Cyan-Green, Green, Yellow- Orange, and Red, respectively.
  • LED(s) 102 each having a different color, Blue, Blue-Cyan, Cyan-Green, Green, Yellow- Orange, and Red, respectively.
  • Associated with each LED 102 are one or more lenses 104 and 106 (labeled with a suffix, i.e., B, BC, CG, G, YO, and R, that corresponds with the LED 102 to which they are associated).
  • a dichroic element 108B combines the light from the Blue LED 102B and the Blue-Cyan LED 102BC to form a Blue channel 11OB.
  • dichroic element 108G combines the light from the Green LED 102G and the Cyan-Green LED 102CG to form a Green channel HOG and dichroic element 108R combines the light from the Yellow-Orange LED 102YO and the Red LED 102R to form a Red channel HOR.
  • Polarizing elements 11 IB, 11 IG, and 11 IR receive the light from their associated dichroic elements 108B, 108G, and 108R and produce a polarization state in the combined light.
  • the polarizing elements 11 IB and 11 IR are configured to produce one polarization orientation in the light in the Blue and Red channels HOB, 11OR, respectively, while the polarizing element 11 IG is configured to produce an orthogonal polarization orientation in the light in the Green channel 11OG.
  • the polarizing elements 11 IB, 11 IG, and 11 IR are wire grid polarizers, but other polarizing elements may be used if desired.
  • polarizing elements 11 IB, 11 IG, and 11 IR are replaced with polarizing elements that are coupled to each LED 102, i.e., the light is polarized prior to the dichroic elements 108.
  • the LEDs 102 may produce polarized light, such as U.S. Serial No. 10/804,314, entitled “Optical System for Light Emitting Diodes” filed on March 19, 2004, and 10/805,424, entitled “Semiconductor Light Emitting Devices Including In-Plane Light Emitting Layers” filed March 19, 2004, both of which are assigned to the assignee of the present disclosure and both of which are incorporated herein by reference in their entireties.
  • Lenses 112B, 112G, and 112R receive the light from each channel 11OB, HOG, and HOR, respectively, and focus the light through a transmissive microdisplay 114B, 114G, and 114R, such as a high temperature poly-silicon (HTPS) liquid crystal microdisplay.
  • a transmissive microdisplay 114B, 114G, and 114R such as a high temperature poly-silicon (HTPS) liquid crystal microdisplay.
  • the light that is transmitted through the microdisplays 114 is combined with a polarization based dichroic element, such as polarization dependent X-cube 116.
  • the microdisplays are imaged by a lens 118 onto a screen 119.
  • the polarization dependency of the X-cube 116 permits the creation of large overlapping recombination regions, which avoids the loss in brightness conventionally associated with overlapping spectra, as well as enabling a larger color gamut.
  • the combination of the channels with large overlapping recombination regions e.g., combining the same wavelengths from both channels, is different than the inadvertent mixing of one channel with the inadvertent leakage flux from another channel. Leakage flux is on the order of approximately 2% or less, and thus, provides very little brightness or color gamut benefit.
  • the wavelengths in the channels that are combined are the primary flux, e.g., greater than 2% of the flux, and more particularly greater than approximately 50% of the flux.
  • Fig. 5 illustrates schematically the combination of the Blue channel 11OB, Green Channel 11OG and the Red channel 11OR with a polarization dependent X-cube 116.
  • Fig. 5 illustrates the polarization states of the different channels, e.g., caused by polarizing elements 11 IB, 11 IG, and 11 IR (shown in Fig. 4) by dots or lines, e.g., the polarization axis is into the page or along the face of the page, respectively.
  • the Blue channel HOB and Red channel 11OR have polarization states that are oriented orthogonally to the polarization state of the Green channel 11OG.
  • Fig. 5 illustrates schematically the combination of the Blue channel 11OB, Green Channel 11OG and the Red channel 11OR with a polarization dependent X-cube 116.
  • Fig. 5 illustrates the polarization states of the different channels, e.g., caused by polarizing elements 11 IB, 11 IG, and 11 IR (shown in Fig
  • FIG. 6 is a graph of the throughput for a polarization dependent dichroic X-cube for orthogonal polarization axes.
  • the Throughput (%) in Fig. 6 illustrates the transmission of the Green light as well as the reflection of the Blue and Red light, as illustrated in Fig. 5.
  • the transmitted wavelengths for the Green light substantially overlaps (in areas 122 and 124) the transmitted (reflected) wavelengths for the Blue and Red light, which have polarization states that are orthogonal to the Green light.
  • Figs. 7A and 7B graphically illustrates the transmission of the polarization dependent dichroic X-cube 116 with respect to the spectra in the Blue, Red channels and the Green channel, respectively.
  • the Green channel is shown in a different graph than the Blue and Red channels so that the curves can be clearly seen.
  • the Blue channel includes two ranges of wavelengths including, Blue and Blue-Cyan, while the Red channel also includes two ranges of wavelengths Yellow-Orange and Red.
  • the spectral emissions of the Blue channel and the Red channel are overlain with the Blue transmission and Red transmission from the X-cube 116.
  • FIG. 7B similarly shows the spectral emissions of the Green channel, which includes two ranges of wavelengths Cyan-Green and Green, overlain with the Green transmission from the X-cube 116.
  • the full range of wavelengths in each color channel can be transmitted by the X- cube 116.
  • the X-cube 116 can combine the overlapping wavelengths because they have different polarization states. Accordingly, with the use of the X-cube 116, the losses caused by overlapping wavelengths, illustrated in Fig. 1 for example, are eliminated. It should be understood that while each channel is described as having two LEDs 102 that produce two different ranges of wavelengths, if desired, only one channel may have two LEDs that produce the two different ranges of wavelengths. For example, it may be particularly advantageous to include two or more ranges of wavelengths in the Red channel. Moreover, it should be understood that the different ranges of wavelengths may include some overlapping wavelengths, which is illustrated in Figs. 7A and 7B.
  • Fig. 8 is a multi -primary LED projection system 200 in which a polarization based X-cube is used to combine different color channels, similar to projection system 100, shown in Fig. 4, like designated elements being the same.
  • the projection system 200 uses a reflective microdisplay 214B, 214G, and 214R, such as a DLP or other Liquid Crystal on Silicon (LCoS) type microdisplay, along with an associated polarization dependent beam splitter 216B, 216G, and 216R.
  • Fig. 9 is another multi-primary LED projection system 300 in which a polarization based dichroic element is used to combine different color channels.
  • a polarization based dichroic element is used to combine different color channels.
  • Projection system 300 is illustrated as including four LEDs 302B, 302R, 302CG, and 302G, sometimes collectively or individually referred to herein as LED(s) 302, each having a different color, Blue, Red, Cyan-Green, and Green, respectively.
  • LED(s) 302 each having a different color, Blue, Red, Cyan-Green, and Green, respectively.
  • Associated with each LED 302 are one or more lenses 304 and 306 (labeled with a suffix, i.e., B, R, CG, and G), that corresponds with the LED 302 to which they are associated).
  • a reflective polarizer element 308 such as a wire grid polarizer, combines the light from the Blue LED 302B and the Red LED 302R.
  • a mirror 310 may be used for polarization recycling. As can be seen, however, the polarizer element 308 produces orthogonal polarization states in the Blue light and the Red light.
  • a reflective polarizer element 312, e.g., wire grid polarizer combines the light from the Green LED 102G and the Cyan-Green LED 102CG. Mirrors 310 and 314 may be used for polarization recycling.
  • the resulting combined light has two different polarization states, i.e., the Green light has a polarization state that is orthogonal to the polarization state of the Cyan- Green light.
  • the reflective polarizer element 308 may be replaced with a dichroic element and separate polarizing elements on each LED 302, or polarized LEDs, to generate the same combined colors with orthogonal polarization states.
  • Lens 316 focuses the combined Red and Blue light into an entrance surface of the polarization based dichroic element 320, while lens 318 focuses the combined Green and Cyan-Green light into a separate entrance surface of the polarization based dichroic element 320.
  • the polarization based dichroic element 320 includes three polarizing beam splitters 322, 324, and 326, and four microdisplays 328, 330, 332, 334.
  • polarized Red light from the Red LED 302R is transmitted through the polarizer element 308 enters a first entrance face 323 of the dichroic element 320 and is transmitted by the polarized beam splitter 322 and received by microdisplay 328.
  • the microdisplay 328 reflects and changes the polarization state of a portion of the Red light, which is reflected by the polarized beam splitter 322 passes through a Red/Blue filter 336 and reflected by polarized beam splitter 326 toward the exit surface 327 of the polarization based dichroic element 320.
  • the Blue light from the Blue LED 302B having the opposite polarization state as the Red light is reflected by the polarizer element 308 enters the first entrance face 323 of the dichroic element 320 and is reflected by the polarized beam splitter 322 and received by microdisplay 330.
  • the microdisplay 330 reflects and changes the polarization state of a portion of the Blue light, which is transmitted by the polarized beam splitter 322 passes through the Red/Blue filter 336, which changes the polarization state of the Blue light, and is reflected by polarized beam splitter 326 toward the exit surface 327 of the polarization based dichroic element 320.
  • the Cyan-Green light from the Cyan-Green LED 302CG is transmitted through the polarizer element 312 enters a second entrance face 325 of the dichroic element 320 and is transmitted by the polarized beam splitter 324 and received by microdisplay 332.
  • the microdisplay 332 reflects and changes the polarization state of a portion of the Cyan-Green light, which is reflected by the polarized beam splitter 324, passed through a Cyan
  • Green/Green filter 338 which changes the polarization state of the Cyan-Green light, and is transmitted by polarized beam splitter 326 toward the exit surface 327 of the polarization based dichroic element 320.
  • the Green light from the Green LED 302G having the opposite polarization state as the Cyan-Green light is reflected by the polarizer element 312, enters the second entrance face 325 of the dichroic element 320 and is reflected by the polarized beam splitter 324 and received by microdisplay 334.
  • the microdisplay 334 reflects and changes the polarization state of a portion of the Green light, which is transmitted by the polarized beam splitter 324, passed through Cyan Green/Green filter 338 and is transmitted by polarized beam splitter 326 toward the exit surface 327 of the polarization based dichroic element 320.
  • Green/Magenta filter 340 at the exit surface changes the polarization states of the Green and Cyan-Green light at the exit surface 327 of the polarization based dichroic element 320 so that the combined light has the same polarization states.
  • the resulting light can then be focused onto a screen 350 with lenses (not shown), similar to that illustrated in Fig. 4.
  • a polarization based dichroic element 320 a four microdisplay system is enabled with a multi-primary LED, while using only three polarization beam splitters and only a few color films. If desired, however, one of the LEDs 302 may be eliminated and only three microdisplays used, which will result, however, in a smaller color gamut.
  • the controller 400 may be a power control circuit that includes a pulse width modulation (PWM) circuit 402 that is coupled to the LEDs in the channel, e.g., 102G and 102CG, in a complementary fashion, so that when one LED 102G is on, the other LED 102CG is off and vice versa.
  • PWM pulse width modulation
  • the PWM circuit 402 is also coupled to the microdisplay 114G so that the information provided by the microdisplay is synchronized with the LED that is on.
  • Fig. 11 illustrates LEDs 102G and 102CG being controlled by controller 400 with a 50% PWM duty cycle, where the top square wave 410 represents the power provided to (and thus, the on/off state of) LED 102G and the bottom square wave 412 represents the power provided to (and thus, the on/off state of) LED 102CG. While the LED 102G is turned on and LED 102CG is off, the microdisplay 114G provides Green color data, and while the LED 102CG is turned on and LEDG is off, the microdisplay 114G provides Cyan- Green color data. Thus, by altering the duty cycle the channel 11OG can be altered to provide more Green color information or more Cyan-Green color information.
  • Fig. 11 illustrates LEDs 102G and 102CG being controlled by controller 400 with a 50% PWM duty cycle, where the top square wave 410 represents the power provided to (and thus, the on/off state of) LED 102G and the bottom square wave 412 represents the power provided to (and thus, the on/off state of
  • the Green channel can be varied anywhere between the Cyan-Green and the Green colors by appropriate PWM control of the LEDs 102CG and LEDG. For example, using a 50% duty cycle, the Green channel produces a color that approximately in the middle of the Cyan-Green and Green colors.
  • the color provided in the Green channel can be shifted anywhere between Cyan-Green and Green, as indicated by arrow 452.
  • the Blue channel can be varied anywhere between the Blue and Blue-Cyan colors, as illustrated by arrow 454, and the Red channel can be varied anywhere between the Yellow-Orange and Red colors through appropriate PWM control of the LEDs, as illustrated by arrow 456.
  • the color gamut is of the multi -primary LED projection system is both increased and controllable.
  • the LEDs are driven using PWM, the current provided to each LED during its on phase can be increased, thereby increasing the luminance of each LED.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Liquid Crystal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un système à diode électroluminescente multiprimaire 100 comprenant l'utilisation d'un élément dichroïque 116 reposant sur une polarisation pour combiner la lumière provenant de différents canaux de couleur 11OB, HOG. Au moins l'un des canaux de couleur HOB comporte deux diodes électroluminescentes 102B, 102BC qui produisent de la lumière avec une plage différente de longueurs d'onde. L'utilisation de l'élément dichroïque 116 reposant sur une polarisation permet de combiner sans perte des spectres se chevauchant de différents canaux de couleur. En conséquence, la luminosité du système est améliorée par rapport aux systèmes conventionnels dans lesquels on observe des pertes lorsque l'on combine des spectres se chevauchant de différents canaux.
EP07849461A 2006-12-13 2007-12-12 Système de projection del multiprimaire Withdrawn EP2106571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/610,242 US7905605B2 (en) 2006-12-13 2006-12-13 Multi-primary LED projection system
PCT/IB2007/055064 WO2008072197A1 (fr) 2006-12-13 2007-12-12 Système de projection del multiprimaire

Publications (1)

Publication Number Publication Date
EP2106571A1 true EP2106571A1 (fr) 2009-10-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07849461A Withdrawn EP2106571A1 (fr) 2006-12-13 2007-12-12 Système de projection del multiprimaire

Country Status (8)

Country Link
US (1) US7905605B2 (fr)
EP (1) EP2106571A1 (fr)
JP (1) JP2010513946A (fr)
KR (1) KR20090090381A (fr)
CN (1) CN101583903B (fr)
BR (1) BRPI0720066A2 (fr)
TW (1) TW200842478A (fr)
WO (1) WO2008072197A1 (fr)

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JP5633695B2 (ja) 2010-11-29 2014-12-03 ソニー株式会社 照明装置、投影型表示装置および直視型表示装置
JP5791118B2 (ja) * 2010-12-21 2015-10-07 Ｎｅｃディスプレイソリューションズ株式会社 プロジェクタおよび画像表示方法
US9262990B2 (en) * 2011-04-27 2016-02-16 Nec Corporation Projector spatially modulating incident light to display images of different colors
JP6086282B2 (ja) * 2012-07-05 2017-03-01 株式会社リコー 画像投影装置
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US7905605B2 (en) 2011-03-15
BRPI0720066A2 (pt) 2013-12-17
WO2008072197A1 (fr) 2008-06-19
KR20090090381A (ko) 2009-08-25
CN101583903A (zh) 2009-11-18

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